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SubjectRe: [PATCHv2] omap3isp: add support for CSI1 bus
Hi Pavel,

On Thu, Mar 02, 2017 at 01:38:48PM +0100, Pavel Machek wrote:
> Hi!
>
> > > Ok, how about this one?
> > > omap3isp: add rest of CSI1 support
> > >
> > > CSI1 needs one more bit to be set up. Do just that.
> > >
> > > It is not as straightforward as I'd like, see the comments in the code
> > > for explanation.
> ...
> > > + if (isp->phy_type == ISP_PHY_TYPE_3430) {
> > > + struct media_pad *pad;
> > > + struct v4l2_subdev *sensor;
> > > + const struct isp_ccp2_cfg *buscfg;
> > > +
> > > + pad = media_entity_remote_pad(&ccp2->pads[CCP2_PAD_SINK]);
> > > + sensor = media_entity_to_v4l2_subdev(pad->entity);
> > > + /* Struct isp_bus_cfg has union inside */
> > > + buscfg = &((struct isp_bus_cfg *)sensor->host_priv)->bus.ccp2;
> > > +
> > > + csiphy_routing_cfg_3430(&isp->isp_csiphy2,
> > > + ISP_INTERFACE_CCP2B_PHY1,
> > > + enable, !!buscfg->phy_layer,
> > > + buscfg->strobe_clk_pol);
> >
> > You should do this through omap3isp_csiphy_acquire(), and not call
> > csiphy_routing_cfg_3430() directly from here.
>
> Well, unfortunately omap3isp_csiphy_acquire() does have csi2
> assumptions hard-coded :-(.
>
> This will probably fail.
>
> rval = omap3isp_csi2_reset(phy->csi2);
> if (rval < 0)
> goto done;

Yes. It needs to be fixed. :-)

>
> And this will oops:
>
> static int omap3isp_csiphy_config(struct isp_csiphy *phy)
> {
> struct isp_csi2_device *csi2 = phy->csi2;
> struct isp_pipeline *pipe = to_isp_pipeline(&csi2->subdev.entity);
> struct isp_bus_cfg *buscfg = pipe->external->host_priv;

There seems to be some more work left, yes. :-I

>
> > > @@ -1137,10 +1159,19 @@ int omap3isp_ccp2_init(struct isp_device *isp)
> > > if (isp->revision == ISP_REVISION_2_0) {
> > > ccp2->vdds_csib = devm_regulator_get(isp->dev, "vdds_csib");
> > > if (IS_ERR(ccp2->vdds_csib)) {
> > > + if (PTR_ERR(ccp2->vdds_csib) == -EPROBE_DEFER)
> > > + return -EPROBE_DEFER;
> >
> > This should go to a separate patch.
>
> Ok, easy enough.
>
> > > dev_dbg(isp->dev,
> > > "Could not get regulator vdds_csib\n");
> > > ccp2->vdds_csib = NULL;
> > > }
> > > + /*
> > > + * If we set up ccp2->phy here,
> > > + * omap3isp_csiphy_acquire() will go ahead and assume
> > > + * csi2, dereferencing some null pointers.
> > > + *
> > > + * ccp2->phy = &isp->isp_csiphy2;
> >
> > That needs to be fixed separately.
>
> See analysis above. Yes, it would be nice to fix it. Can you provide
> some hints how to do that? Maybe even patch to test? :-).

If I only will have the time. Let's see if I can find some time this
week-end.

--
Kind regards,

Sakari Ailus
e-mail: sakari.ailus@iki.fi XMPP: sailus@retiisi.org.uk

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